The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 70
r, and//>in a ; make A w equal to A r, and A p equal to As/ then r inand s p will be the axes required, by, which the ellipsis may bedrawn in the usual way. 126.— To describe an ellipsis, whose axes shall be propor-tionate to the axes of a larger <K smaller given one. Let acbd, (Fig. 91,) be… … Fig. 91. the conjugate axis required, and will bear the same proportion to• j,ascd does to a b. (See Art. 108.) 123 132 0 / \ \ d 1 2 3 m 3 2 1 d Fig. 92. 127.— To describe a parabola by intersection of lines. Leim I, (Fig: 92,) be the axis and height, (see Fig. 79,) and d d} adouble ordinate and…
Carpentry · Architecture
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